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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Allowance for doubtful accounts, trade accounts receivable (in dollars) $ 3,552 $ 2,631
Preferred stock, par value (In dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized 10,000 10,000
Series 2012-A Preferred Stock    
Designated shares 8,750 8,750
Preferred stock, shares issued 2,322 2,322
Preferred stock, shares outstanding 2,322 2,322
Class A common stock    
Common stock, par value (In dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized 35,000 35,000
Common stock, shares issued 1,574 1,574
Common stock, shares outstanding 1,574 1,574
Class B common stock    
Common stock, par value (In dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized 200,000 200,000
Common stock, shares issued 25,805 25,785
Common stock, shares outstanding 24,562 24,755
Treasury stock, shares 1,243 1,030